Design andAnalysis ofaTwoStage Traffic Light System Using Fuzzy Logic

Fuzzy Parameters and Their Membership Functions 
Design
For a two stage traffic lightsystem, there are five membership 
functions such as Zero, Small, Medium, Large and Very-Large for each 
of the input as well asoutput fuzzy variable of the system. There are two 
input variables 
Queue
and 
Time
r
and one output variable
Urgency
for 
traffic urgency decision module as shown in Figure 5-7 respectively. 
For extension time decision module, we designed two input variables 
namely 
Queue-Lane-1, Queue-Lane-2
and one output variable 
Extension-Time 
as shown in Figure 8-10 respectively. Each input and 
output fuzzy variable is design using triangular membership function.